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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.45.30.0/24
network10.45.30.0/24
broadcast10.45.30.255
first host10.45.30.1
last host10.45.30.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.45.30.0/24
address00001010.00101101.00011110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00101101.00011110.00000000
broadcast00001010.00101101.00011110.11111111
green = network part, grey = host part
hex0x0a2d1e00
decimal170728960
reverse dns0.30.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:1e00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.30.0/3010.45.30.1 – 10.45.30.210.45.30.3
210.45.30.4/3010.45.30.5 – 10.45.30.610.45.30.7
310.45.30.8/3010.45.30.9 – 10.45.30.1010.45.30.11
410.45.30.12/3010.45.30.13 – 10.45.30.1410.45.30.15
510.45.30.16/3010.45.30.17 – 10.45.30.1810.45.30.19
610.45.30.20/3010.45.30.21 – 10.45.30.2210.45.30.23
710.45.30.24/3010.45.30.25 – 10.45.30.2610.45.30.27
810.45.30.28/3010.45.30.29 – 10.45.30.3010.45.30.31
910.45.30.32/3010.45.30.33 – 10.45.30.3410.45.30.35
1010.45.30.36/3010.45.30.37 – 10.45.30.3810.45.30.39
1110.45.30.40/3010.45.30.41 – 10.45.30.4210.45.30.43
1210.45.30.44/3010.45.30.45 – 10.45.30.4610.45.30.47
1310.45.30.48/3010.45.30.49 – 10.45.30.5010.45.30.51
1410.45.30.52/3010.45.30.53 – 10.45.30.5410.45.30.55
1510.45.30.56/3010.45.30.57 – 10.45.30.5810.45.30.59
1610.45.30.60/3010.45.30.61 – 10.45.30.6210.45.30.63
1710.45.30.64/3010.45.30.65 – 10.45.30.6610.45.30.67
1810.45.30.68/3010.45.30.69 – 10.45.30.7010.45.30.71
1910.45.30.72/3010.45.30.73 – 10.45.30.7410.45.30.75
2010.45.30.76/3010.45.30.77 – 10.45.30.7810.45.30.79
2110.45.30.80/3010.45.30.81 – 10.45.30.8210.45.30.83
2210.45.30.84/3010.45.30.85 – 10.45.30.8610.45.30.87
2310.45.30.88/3010.45.30.89 – 10.45.30.9010.45.30.91
2410.45.30.92/3010.45.30.93 – 10.45.30.9410.45.30.95
2510.45.30.96/3010.45.30.97 – 10.45.30.9810.45.30.99
2610.45.30.100/3010.45.30.101 – 10.45.30.10210.45.30.103
2710.45.30.104/3010.45.30.105 – 10.45.30.10610.45.30.107
2810.45.30.108/3010.45.30.109 – 10.45.30.11010.45.30.111
2910.45.30.112/3010.45.30.113 – 10.45.30.11410.45.30.115
3010.45.30.116/3010.45.30.117 – 10.45.30.11810.45.30.119
3110.45.30.120/3010.45.30.121 – 10.45.30.12210.45.30.123
3210.45.30.124/3010.45.30.125 – 10.45.30.12610.45.30.127
3310.45.30.128/3010.45.30.129 – 10.45.30.13010.45.30.131
3410.45.30.132/3010.45.30.133 – 10.45.30.13410.45.30.135
3510.45.30.136/3010.45.30.137 – 10.45.30.13810.45.30.139
3610.45.30.140/3010.45.30.141 – 10.45.30.14210.45.30.143
3710.45.30.144/3010.45.30.145 – 10.45.30.14610.45.30.147
3810.45.30.148/3010.45.30.149 – 10.45.30.15010.45.30.151
3910.45.30.152/3010.45.30.153 – 10.45.30.15410.45.30.155
4010.45.30.156/3010.45.30.157 – 10.45.30.15810.45.30.159
4110.45.30.160/3010.45.30.161 – 10.45.30.16210.45.30.163
4210.45.30.164/3010.45.30.165 – 10.45.30.16610.45.30.167
4310.45.30.168/3010.45.30.169 – 10.45.30.17010.45.30.171
4410.45.30.172/3010.45.30.173 – 10.45.30.17410.45.30.175
4510.45.30.176/3010.45.30.177 – 10.45.30.17810.45.30.179
4610.45.30.180/3010.45.30.181 – 10.45.30.18210.45.30.183
4710.45.30.184/3010.45.30.185 – 10.45.30.18610.45.30.187
4810.45.30.188/3010.45.30.189 – 10.45.30.19010.45.30.191
4910.45.30.192/3010.45.30.193 – 10.45.30.19410.45.30.195
5010.45.30.196/3010.45.30.197 – 10.45.30.19810.45.30.199
5110.45.30.200/3010.45.30.201 – 10.45.30.20210.45.30.203
5210.45.30.204/3010.45.30.205 – 10.45.30.20610.45.30.207
5310.45.30.208/3010.45.30.209 – 10.45.30.21010.45.30.211
5410.45.30.212/3010.45.30.213 – 10.45.30.21410.45.30.215
5510.45.30.216/3010.45.30.217 – 10.45.30.21810.45.30.219
5610.45.30.220/3010.45.30.221 – 10.45.30.22210.45.30.223
5710.45.30.224/3010.45.30.225 – 10.45.30.22610.45.30.227
5810.45.30.228/3010.45.30.229 – 10.45.30.23010.45.30.231
5910.45.30.232/3010.45.30.233 – 10.45.30.23410.45.30.235
6010.45.30.236/3010.45.30.237 – 10.45.30.23810.45.30.239
6110.45.30.240/3010.45.30.241 – 10.45.30.24210.45.30.243
6210.45.30.244/3010.45.30.245 – 10.45.30.24610.45.30.247
6310.45.30.248/3010.45.30.249 – 10.45.30.25010.45.30.251
6410.45.30.252/3010.45.30.253 – 10.45.30.25410.45.30.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →